make login hint optional

Author: nilo-ms

common4j/src/main/com/microsoft/identity/common/java/nativeauth/providers/responses/signin/AuthenticationMethodApiResponse.kt

@@ -33,7 +33,7 @@ internal fun AuthenticationMethodApiResponse.toAuthenticationMethodApiResult():
     return AuthenticationMethodApiResult(
         id = this.id ?: throw IllegalStateException("Required field id is empty"),
         challengeType = this.challengeType ?: throw IllegalStateException("Required field challengeType is empty"),
-        loginHint = this.loginHint ?: throw IllegalStateException("Required loginHint id is empty"),
+        loginHint = this.loginHint,
         challengeChannel = this.challengeChannel ?: throw IllegalStateException("Required challengeChannel id is empty")
     )
 }

common4j/src/main/com/microsoft/identity/common/java/nativeauth/providers/responses/signin/AuthenticationMethodApiResult.kt

@@ -7,7 +7,7 @@ import com.microsoft.identity.common.java.nativeauth.util.ILoggable
 data class AuthenticationMethodApiResult(
     @Expose @SerializedName("id") val id: String,
     @Expose @SerializedName("challenge_type") val challengeType: String,
-    @SerializedName("login_hint") val loginHint: String,
+    @SerializedName("login_hint") val loginHint: String?,
     @Expose @SerializedName("challenge_channel") val challengeChannel: String,
 ) : ILoggable {
     override fun toUnsanitizedString() = "AuthenticationMethod(id=$id, " +